Final answer:
All components listed are generally required when starting a plan: the label, internal name, and the parent plan or category, making 'All of the above' the correct choice.
Step-by-step explanation:
When starting a plan, it is generally considered mandatory to clearly define several components to establish the plan's foundation.
While specific requirements can vary by context, common elements often include a) a Label which serves as a clear and identifiable name for the plan, b) an Internal Name which may be used for referencing the plan within an organization, and c) the identification of a Parent plan or category if the plan is part of a larger framework or hierarchical structure.
Hence, d) All of the above would be the correct answer since each element serves a unique and important function in the planning process.